So I have been on bc for two years and I haven't had a period with it for probably a year or so. We…

So I have been on bc for two years and I haven't had a period with it for probably a year or so. We have decided we wanted to try and have a baby so I quit taking birth control about 2 weeks ago. I still haven't had a period yet. Has anyone experienced this? What are the chances that I'm pregnant already?